Grinding-roll.



J. DBELEN.

GRINDING ROLL.

APPLICATION FILED APR. 5,1909.

Patented July 12,1910;

, Inventor Jan Deelen Hhin sea.

' JAN DEELEN, or nnnzn, NErnEaLAnns.

GRINDING-ROLL.

Specification 0t lletters ratent. Patented J l lly 12, 1910.

Application filed April 5, 1908. Serial No. 488,023.

To all whom it may concern:

Be it known that I, J AN DEELEN, a subject of the Queen of theNetherlands, and resident of Heeze, in the Province of North Brabant,Netherlands, have invented a new and useful Grinding-Roll, of which thefollowing is a specification,

This invention relates to improvements in rinding and bruising rollers,made of artihcial .stone.

Objects of the invention are'to manufacture a roller, wherein grindingmaterial of high degree of hardness .is mixed with some material whichis less hard, so that the brittleness of the finished roller isconsiderably reduced in view of the rollers now in exist- GIICB.

Another object is to manufacture a roller wherein the grinding materialand materia which binds the grinding material together are applied to acore, and said core 15 ar-. ranged so thatthrough its shape alone it isadapted to improve the connection between the particles of the entiremass.

Another object is to manufacture a roller which is provided with aplurality of recesses or channels, resembling the rollers made of steelor other metal and to fill these channels with a material of low degreesof hardness. The advantage of this construction rests in the fact thatthe slight depth of these channels can be very easily regained, afterthe outer and harder circumference of the roller is worn off. v p

In the accompanying drawing z-Figure 1, is an illustration of thevarious elements constituting the mass of the stone. .Fig. 2

is a front elevation of a pair of rollers. Fig: I

3, is a side elevation bf the pair of rollers. Fig. 4, is a sectionalview of one roller. Fig. 5, is a section on line CD of Fig. 4.

The mass of the artificial stone is composed of minerals ofat leastthree different degrees of hardness. By way of example two minerals of adifierent degree of hard.-

ness with respect to each other are mixed together in crushed condition,and the size of the single particles may be chosen so, as it seems ofadvanta e for the purpose'for which the roller is to e used. Suchminerals preferably are quartz, bauxites, waste marble or wastefire-stone. To this mixture a mineral in crushed bondition of a lessdegree of hardness than the aforementioned minerals is added, said lastnamed mineral serving as a bindlng means for the entire mass.

-Magnesite or chlorid of magnesium may thus be used as the mineral ofthe lowest de ree of hardness.

n the known grinding and bruising rollers made of artificial stone, thevery hard mass of stones was combined with some very soft mineral, saidlast named mineral forming the binding means. The disadvantage of thiscomposltion was that the wear and tear mainly affected the bindingmeans, so that the grain of the roller after some use lost itsuniformity which the roller had originally. By adding at least onemineral of an intermediate degree of hardness between the hardest andthe softest minerals, and the wear and tear of the stone are madeuniform over the entire circumference and through the entire mass of theroller.

the grain is preserved" and changed the porosity The manufacturingprocess of the grinding or bruising roller according to this inventionis about the following:

In Fig. 1 the particles indicated with 1, designate the material of thehighest degree of hardness, the particles indicated with 3, designatethe material which forms the binding means and the particles indicatedwith 2, designate the material which is combined with the hardestmineral and with the binding means. By adding water or some othersuitable liquid, the entire mass is rendered plastic. For the purpose ofsecuring the mass intimately to the shaft 10, a core 4 preferably ofcast iron is supported on the shaft 10 and held in its place b means ofthe key 11. The core 4 advisa ly is of a cross section which forms anumber of projections; as indicated in Fig. 5, the core is of astar-shape cross section, so that the mass may be disposed in theinterspaces between the projections of this core. Furthermore, it isadvisable'to surround the core 4 by a metal cylinder 6 made ofperforated or corrugated sheet metal which may be reinforced by a numberof ribs 7. In Fig.

. 5, the diameter of the metal cylinder 1s desi nated with a: while thediameter of the finished roller is indicated with y. The mass in itsplastic state is filled in between the cylinder and the intersoacesbetween the promotions of the core and the balance of the plastic massis then molded in its final sha e. The lateral faces of the roller.advisa b'ly are protected by the covers 12 which are fastened to thecore by means of bolts 13.

As indicated in Figs. 2 and 5, the rollers may be provided withpreferably helical flutes 9, which are filled almost in their entiredepth with the material of the lowest de e of hardness, leaving apluralit of h ical notches on the circumference o the roller. When thehardened circumference of the roller is then used up until the outerdiameter of theroller is in onesmooth surface with the binding material8 in the notches, then'these notches may be re aired again by again acircumference provided with helical grooves.

I claim:

A rinding and bruising roller of the class descr1bed,- comprising incombination, a metal core of star-shaped cross-sections, a

moving the'binding materia to a certain depth and the rollers thenpresent cylindrical mantle inclosing said core, a rollmg layerconsisting of a solidified'mixture of m1nerals of different degrees ofhardness, sa1d mixture bein disposed in the interspace between, saiscore and said mantle and mclosm said mantle, and said la er being provled with a plurality of helical grooves on its circumferential surface,said rooves being filled with the mineral of the owest degree ofhardness, a superficial marportion of said grooves being left une Inwitness whereof I have hereunto set my hand in the presence of twowitnesses.

JAN DEELEN. Witnesses:

W. H. Alums, 'W. A: MANIOE.

